Then fringe gray extremum curves have been extracted by two kinds of methods respectively on the basis of Yatagai and Haar dyadic wavelet.

• 运用基于Yatagai和基于Haar二进小波变换的两类方法分别实现了条纹极值线的提取，提出了改进的Hildith细化算法，运用旋转滤波法消除伪分叉点；